/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * This file is part of retabel.
 *
 * Copyright (c) 2011 by individual contributors as indicated by the
 * @author tags. See the copyright.txt file in the distribution
 * for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.retabel.service.number;

import org.retabel.persistence.dao.number.UniqueNumberDao;
import org.retabel.persistence.entity.number.UniqueNumber;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.ejb.EJB;
import javax.ejb.Singleton;
import javax.ejb.TransactionAttribute;
import javax.ejb.TransactionAttributeType;

/**
 * Implementation for {@linkplain NumberService}.
 * <p/>
 * <h3>Extra-Info</h3>
 * Created: 23:25 19.09.11
 *
 * @author Burt Parkers
 * @version 1.0
 */
@Singleton
public class NumberServiceBean implements NumberService {

    /** The logger. */
    private static final Logger logger = LoggerFactory.getLogger(NumberServiceBean.class);

    /** The dao to access the number table. */
    @EJB
    private UniqueNumberDao uniqueNumberDao;


    @Override
    @TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
    public int createUniqueNumber(String numberGroup) {
        UniqueNumber uniqueNumber = uniqueNumberDao.findByNumberGroup(numberGroup);
        int number = 0;
        if (uniqueNumber == null) {
            uniqueNumber = new UniqueNumber();
            uniqueNumber.setNumberGroup(numberGroup);
            uniqueNumberDao.create(uniqueNumber);
        } else {
            number = uniqueNumber.getNumber();
            number += 1;
            uniqueNumber.setNumber(number);
            uniqueNumberDao.merge(uniqueNumber);
        }
        return number;
    }
}
